Could a common constipation medication help clear depression-related brain fog?

Science · Published 8 October 2026 Swipe more like this →

In short: Mental clarity is often the last thing to return after a depressive episode. Researchers have discovered that a licensed laxative, used to treat chronic constipation, might actually sharpen memory and executive function in people with a history of depression.

Cognitive difficulties—often described as 'brain fog'—are frequent symptoms of depression. These issues include challenges with planning, concentration, and memory, and they can persist even after a person's mood has stabilized. To see if these persistent symptoms could be treated, a group of researchers headed by Dr. Angharad de Cates at the University of Birmingham, alongside the University of Oxford, performed an experiment.

The study focused on prucalopride, a medication currently approved for the treatment of chronic constipation. The drug works by stimulating the 5-HT4 R, a specific type of serotonin receptor located in both the brain and the gut. This dual presence explains why a medication targeting the digestive system might have significant neurological effects.

In a randomized trial involving 50 adults who had previously experienced depressive episodes, participants received either a 2mg dose of prucalopride or a placebo for a period of seven to ten days. The researchers required that participants had recovered from their depressive episodes at least six months prior and were not currently taking any medication. The results, published in the journal Psychological Medicine, showed that those taking the drug were both faster and more accurate during cognitive assessments. These tests measured executive function, emotional processing, and both short- and long-term memory. Notably, the researchers reported no significant side effects during the trial.

While these findings are promising, they stem from a relatively small clinical trial. This research highlights the potential for existing, licensed drugs to be repurposed for complex mental health challenges, specifically targeting the cognitive deficits that often remain long after the emotional symptoms of depression have lifted.

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